What device is typically used to measure voltage and resistance during electrical testing?

What device is typically used to measure voltage and resistance during electrical testing?

• A. Oscilloscope
• B. Multimeter
• C. Safety switch
• D. Transformer

Answer: (B)

The multimeter is a versatile instrument commonly used in electrical testing to measure various parameters, including voltage and resistance. It combines multiple functions into one device, allowing users to easily switch between measuring direct current (DC) voltage, alternating current (AC) voltage, and resistance (ohms). For voltage measurement, a multimeter can provide accurate readings across different voltage ranges, making it essential for diagnosing issues in electrical circuits. When measuring resistance, the multimeter applies a small current through the component and measures the resultant voltage, allowing for the calculation of resistance based on Ohm's Law. The other devices listed have more specialized uses. An oscilloscope, for example, is primarily used to visualize waveforms and analyze the time-based characteristics of electrical signals, rather than for straightforward voltage or resistance measurements. A safety switch is designed for protecting circuits, while a transformer is used to change voltage levels in an AC supply rather than measure them. Therefore, the multimeter stands out as the most appropriate tool for measuring both voltage and resistance effectively in electrical testing scenarios.

The multimeter is a versatile instrument commonly used in electrical testing to measure various parameters, including voltage and resistance. It combines multiple functions into one device, allowing users to easily switch between measuring direct current (DC) voltage, alternating current (AC) voltage, and resistance (ohms).

For voltage measurement, a multimeter can provide accurate readings across different voltage ranges, making it essential for diagnosing issues in electrical circuits. When measuring resistance, the multimeter applies a small current through the component and measures the resultant voltage, allowing for the calculation of resistance based on Ohm's Law.

The other devices listed have more specialized uses. An oscilloscope, for example, is primarily used to visualize waveforms and analyze the time-based characteristics of electrical signals, rather than for straightforward voltage or resistance measurements. A safety switch is designed for protecting circuits, while a transformer is used to change voltage levels in an AC supply rather than measure them. Therefore, the multimeter stands out as the most appropriate tool for measuring both voltage and resistance effectively in electrical testing scenarios.